WO2015093074A1 - Moteur - Google Patents

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Publication number
WO2015093074A1
WO2015093074A1 PCT/JP2014/062252 JP2014062252W WO2015093074A1 WO 2015093074 A1 WO2015093074 A1 WO 2015093074A1 JP 2014062252 W JP2014062252 W JP 2014062252W WO 2015093074 A1 WO2015093074 A1 WO 2015093074A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor
thickness
magnet
torque
Prior art date
Application number
PCT/JP2014/062252
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English (en)
Japanese (ja)
Inventor
幹人 佐々木
磯部　真一
Original Assignee
三菱重工プラスチックテクノロジー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱重工プラスチックテクノロジー株式会社 filed Critical 三菱重工プラスチックテクノロジー株式会社
Priority to US15/037,325 priority Critical patent/US10033234B2/en
Priority to CN201480062802.3A priority patent/CN105745819B/zh
Publication of WO2015093074A1 publication Critical patent/WO2015093074A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets

Definitions

  • the present invention relates to a motor, and more specifically, is suitable for a synchronous reluctance motor that uses reluctance torque and magnet torque by embedding a permanent magnet in a rotor so as to have saliency.
  • a motor is a device that converts electrical energy into work (rotational energy).
  • a typical motor is a synchronous motor, in which a rotor is attracted to a stator by a rotating magnetic field generated by an alternating current applied to the stator, and rotates following the rotating magnetic field.
  • a permanent magnet synchronous motor (PM synchronous motor) is more efficient than an induction motor or an electromagnet synchronous motor.
  • Motors used in industrial machines such as injection molding machines are required to generate high torque.
  • a permanent magnet embedded synchronous motor IPM synchronous motor
  • the torque equation of the permanent magnet motor is given by equation (1).
  • T p (Ld ⁇ Lq) IdIq + p ⁇ 0 Iq (1)
  • p number of motor poles Ld
  • Lq d-axis or q-axis inductance
  • Id d-axis or q-axis current
  • ⁇ 0 magnet magnetic flux
  • the first term in equation (1) is the reluctance torque generated by the difference in magnetic resistance
  • the second term is the magnet torque generated by the magnetic force of the magnet.
  • the magnet torque is a torque generated by attraction and repulsion between the permanent magnet and the rotating magnetic field, and is generated by the permanent magnet embedded in the motor.
  • the reluctance torque is a torque generated by a saliency in which the magnetic resistance changes depending on the position of the rotor.
  • An axis along the magnetic field of the rotor is defined as d-axis, and an axis electromagnetically orthogonal to the d-axis is defined as q-axis.
  • the flow of magnetic flux in the d-axis direction passes through a permanent magnet having a low magnetic permeability, so that the electromagnetic resistance increases and the d-axis inductance Ld increases.
  • the q-axis direction is directed to the side surface of the permanent magnet, it does not pass through the permanent magnet, but passes through a magnetic material having a high magnetic permeability, so that the electromagnetic resistance is reduced and the q-axis inductance Lq is reduced. Based on the difference between these inductances, reluctance torque is generated by the rotating magnetic field. As is clear from the equation (1), the reluctance torque increases as the difference in inductance increases.
  • a reverse magnetic field is applied to the permanent magnet by the rotating magnetic field. Since the reverse magnetic field acts as a demagnetizing field for the permanent magnet, the permanent magnet at a position where a strong demagnetizing field works may be demagnetized if the coercive force is small.
  • the motor design is usually performed on the premise that no demagnetization occurs. For this reason, if it is used in a state where demagnetization is likely to occur, the possibility of not satisfying the required performance increases, and the reliability of the product decreases. In order to prevent this, it is necessary to design with a margin (usually about 1%) in the amount of magnetic flux generated by the permanent magnet. However, if the demagnetizing factor is high, it is necessary to keep a large margin, resulting in an increase in cost. Further, when the demagnetization factor is high, the decrease in magnetization is fast, and the life as a motor is shortened. From these, the permanent magnet used for the motor is required to have a high demagnetization resistance.
  • motors with high torque and high demagnetization resistance can be designed by using high-performance permanent magnets or increasing the amount, but problems such as higher costs and increased product volume and mass have arisen. End up. Therefore, for example, in Patent Document 1, in order to prevent demagnetization of an arc-shaped permanent magnet having a multi-layer structure, a permanent magnet having an arc angle of 90 ° or less is highly reduced while increasing the thickness of two magnets on the outer circumferential side of the rotor. Achieves magnetic strength. However, in this case, since the arc angle is 90 ° or less, the magnet torque becomes small and the total torque is reduced.
  • the present invention aims to provide a compact motor that generates high torque without demagnetization and can be realized at low cost.
  • a motor includes a stator that generates a rotating magnetic field, a rotor that is rotatably supported by a shaft inside the stator, and an arc shape in which the inner side of the rotor is convex.
  • the outermost permanent magnet which is a permanent magnet embedded in the rotor
  • the inner permanent magnet which is a permanent magnet embedded in an arc shape in which the inner side of the rotor is convex inside the rotor of the outermost permanent magnet inside the rotor
  • the thickness of the central portion of the inner permanent magnet is thinner than the thickness of the central portion of the outermost permanent magnet, and the thickness of the end portion of the inner permanent magnet is the same as that of the outermost permanent magnet. It is characterized by being thicker than the thickness.
  • the thickness of the central part of the inner permanent magnet is made thinner than that of the outermost peripheral permanent magnet, so that the magnetic body between the permanent magnets can be thickened and the d-axis magnetic flux passing between the permanent magnets can be increased.
  • demagnetization may occur by bringing the inner permanent magnet end closer to the outer periphery of the rotor.
  • the inner permanent magnet end thicker than the outermost permanent magnet, high demagnetization resistance Plan Thereby, a motor with high torque and high demagnetization resistance can be realized without greatly increasing the amount of magnets.
  • WHEREIN The curvature of the center part of the circular arc of the outer wall of a rotor of the innermost inner permanent magnet nearest to the axis among inner permanent magnets is located on the outer side of the rotor more than the innermost inner permanent magnet. You may be smaller than the curvature of the center part of the circular arc of the wall inside the rotor of the outermost periphery permanent magnet or inner permanent magnet arrange
  • the circular arc of the center part of the inner wall of a rotor of an innermost circumference inner permanent magnet is the outermost circumference permanent magnet or inner permanent magnet arrange
  • the central portion of the permanent magnet is thin and the end portion is thick, when the distance between the end portions of the permanent magnet is the same, the permanent magnet disposed on the innermost periphery and the permanent magnet disposed adjacent thereto are provided.
  • the area of the center part of the magnetic body between the magnets can be increased. For this reason, more d-axis magnetic flux can be attracted to the magnetic substance center part in a limited space. Since the number of d-axis magnetic fluxes closer to the rotor axis affects the reluctance torque, the torque is remarkably improved by increasing the area of the central portion of the magnetic body closest to the axis.
  • the arc angle of the outermost permanent magnet and the inner permanent magnet may be larger than 90 °.
  • both ends of the magnet can be brought closer to the outer peripheral side, and the magnet torque can be increased.
  • the magnetic flux (d-axis magnetic flux) passing between the permanent magnets decreases, and the d-axis inductance may decrease and the reluctance torque may decrease.
  • the thickness of the central part of the inner permanent magnet is made thinner than that of the outermost peripheral permanent magnet, thereby increasing the thickness of the magnetic material between the permanent magnets and increasing the d-axis magnetic flux passing between the permanent magnets.
  • the thickness of the central portion of the inner permanent magnet may be 0.75 times or more the thickness of the central portion of the outermost peripheral permanent magnet.
  • the thickness of the end portion of the inner permanent magnet may be 1.3 times or less the thickness of the end portion of the outermost peripheral permanent magnet.
  • the thickness of the end portion of the inner permanent magnet may be 1.2 times or more the thickness of the end portion of the outermost peripheral permanent magnet.
  • the outermost permanent magnet or the inner permanent magnet may be divided in the rotor circumferential direction.
  • the mass per magnet can be reduced, and the centrifugal stress acting on the rotor core can be reduced. Furthermore, since the rotor meat remains in the center of the magnet, the enlargement of the slit by the permanent magnet subjected to centrifugal force can be suppressed, and deformation can be prevented.
  • the inner permanent magnet may have two layers.
  • the permanent magnets are preferably three or more layers in total. However, if there are four or more layers, the magnet will be thin, and the magnet torque will be small, and there is a possibility that a large torque will not be generated. In this configuration, the inner permanent magnet has two layers and the outermost permanent magnet has three layers, so that a large torque can be generated in a limited space.
  • the magnet torque is increased without significantly increasing the amount of permanent magnets, the reluctance torque is increased by increasing the d-axis magnetic flux passing through the magnetic material, and the demagnetization resistance is improved.
  • a motor with high torque and high demagnetization resistance can be realized at low cost.
  • FIG. 4 is a partial cross-sectional view showing rotation according to an embodiment of the present invention.
  • the graph which showed the change of a torque and the amount of magnetic flux when changing the magnetization direction thickness of the magnet center part of the 2nd, 3rd layer. It is the result of having analyzed about the demagnetization factor produced when a magnetic field is generated in the rotor concerning one embodiment of the present invention.
  • the motor 1 which concerns on one Embodiment of this invention is demonstrated using FIG.1 and FIG.2.
  • the motor 1 according to the present embodiment includes a stator 2 that can be wound with a winding and can generate a rotating magnetic field in the center by an alternating current, and an interior of the stator 2 with a shaft 3 as a center.
  • the cylindrical rotor 4 is supported so as to be rotatable, and 24 permanent magnets 5 embedded in the rotor 4 are provided.
  • the permanent magnet 5 is composed of an outermost peripheral permanent magnet 5a and inner permanent magnets 5b, 5c.
  • the inner permanent magnet 5c is the innermost peripheral inner permanent magnet 5c.
  • the rotor 4 serving as a magnetic body is made of iron, and the permanent magnets 5 are all ferrite magnets, but are not essential.
  • the permanent magnet 5 may use a neodymium magnet and is not limited to the present embodiment, but the present embodiment increases the magnet torque by bringing both ends of the magnet closer to the outer peripheral side.
  • a high performance ferrite magnet or neodymium magnet having a high residual magnetic flux density and a very strong magnetic force is suitable.
  • the rotor 4 is provided with three arc-shaped slits 6a, 6b, 6c, and permanent magnets 5a, 5b, 5c are embedded one by one. Eight sets of these three slits 6 and three permanent magnets 5 are provided in one rotor 4. Hereinafter, one set will be described with reference to FIG.
  • the slit 6 is formed in a circular arc shape that is convex on the inner side of the rotor 4 (hereinafter referred to as “rotor inner side”; In other words, the distance between the center line of the slit 6 and the axis of the shaft 3 is the shortest at the center M of the slit 6 and longer at the end. Further, both ends of the slit 6 are close to the outer periphery of the rotor 4 (hereinafter referred to as “rotor outer periphery”, the inner periphery is also the same), the slit 6a is outside the rotor of the slit 6b, and the slit 6b is outside the rotor of the slit 6c. Is provided. The slits 6 do not intersect.
  • the width of the permanent magnet 5 is substantially the same as the width of the slit 6, the permanent magnet 5 and the slit 6 have substantially the same shape, but the length of the slit 6 is longer.
  • the permanent magnet 5 is embedded almost at the center of the slit 6.
  • the innermost permanent magnet 5a is embedded in the slit 6a
  • the inner permanent magnet 5b is embedded in the slit 6b
  • the innermost inner permanent magnet 5c is embedded in the slit 6c.
  • only the innermost inner permanent magnet 5c is divided in the circumferential direction at the center M, and the slit 6c is also divided accordingly.
  • the outermost peripheral permanent magnet 5 a is a permanent magnet on the outermost periphery of the rotor 4
  • the innermost peripheral inner permanent magnet 5 c is a permanent magnet on the innermost periphery of the rotor 4. Further, the central portion M of the innermost inner permanent magnet 5 c is closest to the shaft 3.
  • All the magnetic poles of the permanent magnets 5a, 5b, 5c are embedded in the same direction in the radial direction of the rotor 4. However, the magnetic poles of the permanent magnets adjacent to each other in the circumferential direction of the rotor 4 are embedded so as to be different from each other in the radial direction of the rotor 4.
  • the arc angle ⁇ of the permanent magnets 5a, 5b, 5c is larger than 90 °, and is set to 135 ° in this embodiment. In other words, among the angles formed by the regression line A1 of one end E of the permanent magnets 5a, 5b and 5c and the regression line A2 of the other end E, the permanent magnets 5a, 5b and 5c are opened toward the permanent magnets 5a, 5b and 5c. However, the arc angle ⁇ is greater than 90 °.
  • the width of the central portion M of the inner permanent magnet 5b and the innermost inner permanent magnet 5c is thinner than the width of the central portion M of the outermost permanent magnet 5a. For this reason, the thickness of the magnetic body between the permanent magnets 5 is increased.
  • the width of the central portion M of the inner permanent magnets 5b and 5c is 0.9 times the width of the central portion M of the outermost peripheral permanent magnet 5a.
  • the width of the end E of the inner permanent magnets 5b and 5c is thicker than the width of the end E of the outermost peripheral permanent magnet 5a.
  • the width of the end E of the inner permanent magnets 5b and 5c is 1.2 times the width of the end E of the outermost peripheral permanent magnet 5a.
  • the central portion M of the arc formed by the outer wall O of the innermost inner permanent magnet 5c has a smaller curvature than the central portion M of the outer arc O formed by the outer wall O of the inner permanent magnet 5b. ing.
  • the width of the arc formed by the inner wall I of the innermost permanent magnet 5c and the arc formed by the outer wall O of the inner permanent magnet 5b is substantially constant.
  • the rotor 4, the permanent magnet 5, and the slit 6 have substantially the same thickness along the axial direction.
  • the slit 6 passes through the rotor 4.
  • the permanent magnet 5 may be divided in the rotor circumferential direction. In this embodiment, only the innermost inner permanent magnet 5c is divided at the central portion M.
  • the innermost inner permanent magnet 5c having the largest mass has a larger centrifugal stress when the motor 1 rotates unless the innermost inner permanent magnet 5c is divided in the circumferential direction. . Due to this centrifugal force, the slit 6c receiving the mass of the innermost inner permanent magnet 5c may be expanded and deformed in the radial direction. Therefore, the innermost inner permanent magnet 5c and the slit 6c are divided to leave the rotor 4 in the center M.
  • the expansion deformation of the slit 6 can be prevented by the connecting portion of the iron core of the radial rotor 4 in the central portion M.
  • the strength performance of the iron core can be improved.
  • T p (Ld ⁇ Lq) ldlq + p ⁇ 0 Iq (1)
  • P number of motor poles Ld
  • Lq d-axis or q-axis inductance
  • Id d-axis or q-axis current
  • ⁇ 0 magnet magnetic flux
  • the first term in equation (1) is the reluctance torque generated by the difference in magnetic resistance
  • the second term is a magnet torque generated by the magnetic force of the permanent magnet 5.
  • the magnet torque is torque generated by attraction and repulsion between the permanent magnet 5 and the rotating magnetic field, and is generated by the permanent magnet 5 embedded in the motor 1.
  • the reluctance torque is a torque generated from a rotating magnetic field due to a difference in magnetic resistance between a d-axis that is an axis along a magnetic field formed by the rotor 4 having saliency and a q-axis that is electromagnetically orthogonal to the d-axis. is there.
  • the flow of magnetic flux in the d-axis direction passes through the permanent magnet 5 having a low magnetic permeability, so that the electromagnetic resistance increases and the d-axis inductance Ld increases.
  • the q-axis direction is directed to the side surface of the permanent magnet 5 and passes only through a magnetic material having a high permeability without passing through the permanent magnet 5, the electromagnetic resistance is reduced and the q-axis inductance Lq is reduced. . Based on the difference between these inductances, reluctance torque is generated by the rotating magnetic field. As is clear from the equation (1), the reluctance torque increases as the difference in inductance increases.
  • the arc angle ⁇ of the permanent magnet 5 is preferably 90 ° or more.
  • the magnetic flux ⁇ 0 can be used more effectively than in the case of 90 ° or less, which corresponds to the second term of the formula (1).
  • Magnet torque increases. As shown in FIG. 6, the magnet torque increases in proportion to the arc angle of the permanent magnet 5.
  • the value of the ratio of magnet torque / reluctance torque is 0.5 or more.
  • the value of the ratio of magnet torque / reluctance torque is smaller than 0.5, the reluctance torque is mainly used, and the vibration / noise of the motor 1 is increased, which is unacceptable in terms of strength and use environment.
  • the value of the ratio of the magnet torque / reluctance torque becomes 0.5 or more, and vibration / noise of the motor 1 can be suppressed.
  • the magnet torque in the slit 6 should be 1.8 times or more of the magnet torque of the magnet arc angle of 45 degrees where the area of the permanent magnet 5 and air is about 1: 1. Can do.
  • the magnetic flux by a rotating magnetic field passes between the permanent magnets 5 by taking the said structure.
  • the inductance is represented by the ratio of magnetic flux to current
  • the inductance Lq is determined by the number of magnetic fluxes (d-axis magnetic flux 7) at the same current.
  • the d-axis magnetic flux 7 is a magnetic flux in a direction parallel to the permanent magnet 5.
  • Lq increases, and the inductance torque increases from equation (1).
  • the d-axis magnetic flux 7 increases as the applied magnetic field is stronger.
  • the d-axis magnetic flux 7 increases as the passable area increases after the magnetic flux density is saturated. Since the d-axis magnetic flux 7 is saturated during normal use of the motor 1, the reluctance torque increases as the area through which the magnetic flux can pass is larger.
  • the thickness of the magnetic material between the permanent magnets 5 is increased, the area through which the magnetic flux can pass is increased and the d-axis magnetic flux 7 and Lq are increased. As a result, the first term of the equation (1) is satisfied. The corresponding reluctance torque increases.
  • FIG. 4 shows the result of analyzing the torque when the magnet thickness is actually changed. The analysis was performed with finite element method analysis software JMAG (manufactured by JSOL Corporation).
  • FIG. 3 shows changes in the amount of magnetic flux when a torque and a rotating magnetic field are applied when the thickness at the central portion M of the inner permanent magnets 5b and 5c is uniformly changed.
  • the thickness is 1.00 in the first layer
  • the torque is normalized to a certain value by 100
  • the amount of magnetic flux is 100% (demagnetization factor 0%) before applying a demagnetizing field.
  • the torque is 1 time or more and less than 0.75 times. growing.
  • this embodiment makes the magnet central part size of the inner permanent magnets 5b, 5c 0.75 times or more the outermost peripheral permanent magnet 5a 1 It shows that the torque can be maximized by making the ratio less than twice. Therefore, in this embodiment, it can be said that the value which becomes 0.75 times or more and less than 1 time of the outermost periphery permanent magnet 5a is the optimal value for the magnet central part size of the inner permanent magnets 5b and 5c. In addition, since the maximum value (about 105.5) is obtained at 0.9 times, 0.9 times is adopted in the present embodiment.
  • FIG. 4 shows the result of examining the demagnetizing factor generated at this time.
  • the analysis was performed with finite element method analysis software JMAG (manufactured by JSOL Corporation).
  • JMAG finite element method analysis software
  • FIG. 5 shows the result of examining about the optimum end thickness.
  • the analysis was performed with finite element method analysis software JMAG (manufactured by JSOL Corporation). Torque is analyzed when only the thickness of the end portion E is changed while the thickness of the center portion M is 0.9 times that of the outermost peripheral permanent magnet (also described as a case of 0.8 times as a reference).
  • the rate of torque reduction is relatively gradual compared to the case of 1.2 times or more. Furthermore, both the center and end portions exceed the maximum torque (about 105.5) when 0.9 times the outermost peripheral permanent magnet 5a.
  • the magnetic flux amount is 99% or more (demagnetization factor is 1% or less), and the torque is the same as that of the outermost peripheral permanent magnet 5a at both the center and the end (that is, a conventional permanent magnet having a uniform thickness is used.
  • the magnet end dimensions of the inner permanent magnets 5b and 5c according to the present embodiment can be optimized with respect to the dimension of the outermost peripheral permanent magnet 5a, and the motor torque of the motor 1 according to the present embodiment exceeds that of the conventional method. Can be obtained.
  • the center M of the arc formed by the outer wall O of the innermost inner permanent magnet 5c is more than the center M of the arc formed by the outer wall O of the inner permanent magnet 5b.
  • the curvature is formed to be small.
  • the curvature of the arc formed by the central portion M of the inner wall I of the innermost permanent magnet 5c and the central portion M of the outer wall O of the inner permanent magnet 5b is the same. It is almost parallel. In this state, the central portion M of the inner permanent magnets 5b and 5c is thinned and the end portion E is thickened. In other words, in FIG. 2, the permanent magnets 5b and 5c have the same lengths of the end outer wall surface distance L1 and the central outer wall surface distance L2 and the same curvature, and further the end facing wall surface distance S2 from the center facing wall surface distance S1. Is formed to be shorter.
  • the center M of the arc formed by the outer wall O of the innermost inner permanent magnet 5c has a smaller curvature than the center M of the arc formed by the outer wall O of the inner permanent magnet 5b. Formed. Further, the curvature of the outer wall O of the inner permanent magnets 5b and 5c is smaller than the inner wall I of the rotor.
  • the thickness of the magnet at the central portion M having a low demagnetization rate is thinner than that in the case where the magnitude of the curvature is reversed, and the inner permanent magnet 5b. , 5c increases the distance between the central portions M. Accordingly, the magnetic flux path (magnetic path) can be widened in a limited space, and the magnetic path of the d-axis magnetic flux 7 is widened, so that high torque can be realized.
  • the arc angle ⁇ of the permanent magnet 5 is made larger than 90 °, and the thickness of the central portion M of the inner permanent magnets 5b, 5c is made thinner than the thickness of the central portion M of the outermost peripheral permanent magnet 5a.
  • the demagnetization resistance is improved by making the thickness of the end E of the inner permanent magnets 5b and 5c larger than the thickness of the end E of the outermost peripheral permanent magnet 5a.
  • the curvature of the center M of the arc formed by the outer wall O of the innermost inner permanent magnet 5c is smaller than that of the center M of the arc formed by the outer wall O of the inner permanent magnet 5b.
  • the width of the arc formed by the inner wall I of the innermost permanent magnet 5c and the arc O formed by the outer wall O of the inner permanent magnet 5b is made substantially constant.
  • the area of the central portion M of the magnetic body between the permanent magnets is made larger and the area of the end portion E is made smaller. Furthermore, the optimum dimensions with high demagnetization resistance and large torque were determined from the analysis results.
  • the present invention is not limited to this.
  • four slits 6 and four permanent magnets 5, two slits 6 and two permanent magnets 5 may be used, and 6 sets or 10 sets may be considered instead of 8 sets.
  • the four or more slits 6 and the four or more permanent magnets 5 may cause the permanent magnets to become thin, so that the magnet torque becomes small and a necessary magnetic force cannot be generated.
  • the two slits 6 and the two permanent magnets 5 do not have a sufficient passage path for the d-axis magnetic flux 7, and the reluctance torque may be reduced and the necessary magnetic force may not be generated.
  • the three slits 6 and the three permanent magnets 5 are desirable.
  • the width of the permanent magnet 5a is substantially constant, but the present invention is not limited to this.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

Le but de la présente invention est de fournir un moteur compact qui peut être obtenu à faible coût et qui génère un couple élevé sans la survenue d'une désaimantation. Le moteur est caractérisé par le fait de comporter : un stator qui génère un champ magnétique rotatif ; un rotor porté de manière rotative par un arbre à l'intérieur du stator ; un aimant permanent périphérique le plus à l'extérieur (5a) qui est un aimant permanent intégré à l'intérieur du rotor dans une forme arquée en formant une convexité au niveau de la surface interne du rotor ; et un aimant permanent interne (5b, 5c) qui est un aimant permanent intégré à l'intérieur du rotor en parallèle avec l'aimant permanent périphérique le plus à l'extérieur (5a). Le rotor est en outre caractérisé par le fait que l'angle d'arc des aimants permanents (5a, 5b, 5c) est supérieur à 90°C, l'épaisseur au niveau du centre des deux aimants permanents internes (5b, 5c) est inférieure à l'épaisseur au niveau du centre de l'aimant permanent périphérique le plus à l'extérieur (5a), et l'épaisseur au niveau des extrémités des deux aimants permanents internes (5b, 5c) est supérieure à l'épaisseur au niveau des extrémités de l'aimant permanent périphérique le plus à l'extérieur (5a).
PCT/JP2014/062252 2013-12-20 2014-05-07 Moteur WO2015093074A1 (fr)

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Application Number Priority Date Filing Date Title
US15/037,325 US10033234B2 (en) 2013-12-20 2014-05-07 Motor
CN201480062802.3A CN105745819B (zh) 2013-12-20 2014-05-07 电动机

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Application Number Priority Date Filing Date Title
JP2013264304A JP6215041B2 (ja) 2013-12-20 2013-12-20 モータ
JP2013-264304 2013-12-20

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CN106921270A (zh) * 2015-10-20 2017-07-04 株式会社捷太格特 同步磁阻马达

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20150729A1 (it) * 2015-05-22 2016-11-22 Enerdrive Ltd Motore sincrono a riluttanza assistito da magneti permanenti
US11121614B2 (en) 2017-06-05 2021-09-14 E-Circuit Motors, Inc. Pre-warped rotors for control of magnet-stator gap in axial flux machines
US11527933B2 (en) 2015-10-02 2022-12-13 E-Circuit Motors, Inc. Stator and rotor design for periodic torque requirements
CN106300734A (zh) * 2016-08-31 2017-01-04 法乐第(北京)网络科技有限公司 电机的转子、电机及车辆
JP2018153047A (ja) 2017-03-14 2018-09-27 本田技研工業株式会社 回転電機のロータ
US11005322B2 (en) 2017-06-05 2021-05-11 E-Circuit Motors, Inc. Rotor assemblies for axial flux machines
US11831211B2 (en) 2017-06-05 2023-11-28 E-Circuit Motors, Inc. Stator and rotor design for periodic torque requirements
JP7132729B2 (ja) * 2018-03-12 2022-09-07 株式会社デンソー 回転電機
JP7029124B2 (ja) * 2018-04-17 2022-03-03 株式会社ダイドー電子 永久磁石回転子および回転電気機械
CN108777520B (zh) * 2018-07-17 2020-03-27 珠海格力电器股份有限公司 一种交替极电机
WO2021065687A1 (fr) * 2019-09-30 2021-04-08 ダイキン工業株式会社 Rotor et moteur
JPWO2021171663A1 (fr) * 2020-02-27 2021-09-02
US11626779B2 (en) 2021-02-17 2023-04-11 E-Circuit Motors, Inc. Planar stator having discrete segments with different winding characteristics
JP7085247B1 (ja) 2021-02-22 2022-06-16 株式会社フリーベアコーポレーション 支持ユニット
EP4378054A2 (fr) 2021-07-30 2024-06-05 E-Circuit Motors, Inc. Cartes de circuit imprimé remplies de matériau magnétique et stators de carte de circuit imprimé
WO2023007707A1 (fr) * 2021-07-30 2023-02-02 川崎重工業株式会社 Rotor et moteur
US11336130B1 (en) 2021-08-17 2022-05-17 E-Circuit Motors, Inc. Low-loss planar winding configurations for an axial flux machine
US11955843B2 (en) 2021-12-22 2024-04-09 Abb Schweiz Ag Synchronous reluctance motor
US11611304B1 (en) * 2022-03-03 2023-03-21 GM Global Technology Operations LLC System and method for minimizing demagnetization in rotor magnets

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009044893A (ja) * 2007-08-09 2009-02-26 Toyota Industries Corp 回転子及び回転電機
JP2011083066A (ja) * 2009-10-02 2011-04-21 Osaka Prefecture Univ 永久磁石補助形同期リラクタンスモータ
JP2011091911A (ja) * 2009-10-21 2011-05-06 Fuji Electric Systems Co Ltd 永久磁石式回転電機
US20130147302A1 (en) * 2011-12-09 2013-06-13 GM Global Technology Operations LLC Rotor barrier shaping for demagnetization mitigation in an internal permanent magnet machine
JP2013247781A (ja) * 2012-05-25 2013-12-09 Jtekt Corp ロータ及びこれを備えた回転電機
JP2013251948A (ja) * 2012-05-30 2013-12-12 Mitsubishi Electric Corp 永久磁石埋込型電動機
WO2013187439A1 (fr) * 2012-06-14 2013-12-19 ダイキン工業株式会社 Machine électrique tournante de type à aimant intégré

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69629419T2 (de) * 1995-05-31 2004-04-01 Matsushita Electric Industrial Co., Ltd., Kadoma Motor mit eingebauten Permanentmagneten
BR9504773A (pt) 1995-10-04 1997-09-02 Brasil Compressores Sa Rotor com imãs permanentes para motor elétrico
JP3051340B2 (ja) * 1996-06-18 2000-06-12 オークマ株式会社 同期電動機
GB2378323B (en) * 2001-07-28 2005-07-27 Lg Electronics Inc Rotor for synchronous reluctance motor and manufacturing method thereof
US6703746B2 (en) 2002-03-01 2004-03-09 General Motors Corporation Interior permanent magnet rotor
CN102801235B (zh) * 2011-08-05 2013-09-18 珠海格力电器股份有限公司 电动机转子及具有其的电动机
CN102780291A (zh) * 2011-08-05 2012-11-14 珠海格力电器股份有限公司 电动机转子及具有其的电动机
CN102761182B (zh) * 2011-08-05 2013-03-27 珠海格力电器股份有限公司 电动机转子及具有其的电动机
CN202142924U (zh) * 2011-08-05 2012-02-08 珠海格力电器股份有限公司 电动机转子及具有其的电动机
US8860275B2 (en) * 2011-12-09 2014-10-14 GM Global Technology Operations LLC Multi-layer arc-shaped permanent magnet machine with reduced rotational stress
CN102761184B (zh) * 2012-03-05 2013-04-17 珠海格力节能环保制冷技术研究中心有限公司 永磁辅助同步磁阻电机及其转子和电机的安装方法
US8928197B2 (en) * 2012-04-17 2015-01-06 GM Global Technology Operations LLC Pole-to-pole asymmetry in interior permanent magnet machines with arc-shaped slots
US8664822B2 (en) * 2012-05-30 2014-03-04 GM Global Technology Operations LLC Bi-permanent magnets in synchronous machines
US8664823B2 (en) * 2012-05-30 2014-03-04 GM Global Technology Operations LLC Magnetic barrier for minimizing demagnetization in bi-permanent magnet synchronous machines
US8760025B2 (en) * 2012-08-09 2014-06-24 GM Global Technologies Operations LLC Interior permanent magnet machine having off axis centered arc geometry
US9118230B2 (en) * 2013-02-07 2015-08-25 GM Global Technology Operations LLC Interior permanent magnet machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009044893A (ja) * 2007-08-09 2009-02-26 Toyota Industries Corp 回転子及び回転電機
JP2011083066A (ja) * 2009-10-02 2011-04-21 Osaka Prefecture Univ 永久磁石補助形同期リラクタンスモータ
JP2011091911A (ja) * 2009-10-21 2011-05-06 Fuji Electric Systems Co Ltd 永久磁石式回転電機
US20130147302A1 (en) * 2011-12-09 2013-06-13 GM Global Technology Operations LLC Rotor barrier shaping for demagnetization mitigation in an internal permanent magnet machine
JP2013247781A (ja) * 2012-05-25 2013-12-09 Jtekt Corp ロータ及びこれを備えた回転電機
JP2013251948A (ja) * 2012-05-30 2013-12-12 Mitsubishi Electric Corp 永久磁石埋込型電動機
WO2013187439A1 (fr) * 2012-06-14 2013-12-19 ダイキン工業株式会社 Machine électrique tournante de type à aimant intégré

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106921270A (zh) * 2015-10-20 2017-07-04 株式会社捷太格特 同步磁阻马达

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